slanderer vs backbiter

slanderer and backbiter both are nouns.

Word	Noun	Adjective	Verb	Adverb
slanderer	Yes	No	No	No
backbiter	Yes	No	No	No

As nouns, slanderer and backbiter are synonyms defined as:

slanderer and backbiter: one who attacks the reputation of another by slander or libel

Other synonyms of slanderer include defamer, libeler, maligner, traducer, vilifier.

slanderer (noun)	backbiter (noun)
one who attacks the reputation of another by slander or libel	one who attacks the reputation of another by slander or libel